Postural control is altered in patients with ankylosing spondylitis

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• 作者：Martin E. Vergara^a ; Finbar D. O'Shea^b ; Robert D. Inman^b ; William H. Gage^a ; ^c ; ^{whgage@yorku.ca}
• 关键词：Ankylosing spondylitis ; Postural control ; Quiet standing ; Center of pressure ; Physical function
• 刊名：Clinical Biomechanics
• 出版年：2012
• 期刊代码：56_02680033
• 类别：med
• 出版时间：May, 2012
• 卷：27
• 期：4
• 页码：334-340
• 文件大小：441 K

摘要

Background

Ankylosing spondylitis is a chronic inflammatory disorder that can lead to increased axial and peripheral joint stiffness, impairing joint mobility. Impaired axial mobility due to vertebral ankylosis may result in changes in standing postural control. Little research has addressed changes in standing postural control in the ankylosing spondylitis population, nor how these issues might affect clinical understanding and treatment.

Methods

Sixteen ankylosing spondylitis patients, and 17 healthy controls participated. Each individual completed two 120-second quiet standing trials with eyes open and eyes closed, while standing upon two force platforms. Net center of pressure displacement and mean power frequency in the frontal and sagittal planes were calculated. A Spearman's rank correlation analysis was performed between net center of pressure measures and several clinical measures of disease activity.

Findings

Frontal plane net center of pressure displacement and frequency content, and sagittal plane net center of pressure displacement were significantly greater within the ankylosing spondylitis patient group. Ankylosing spondylitis patients demonstrated a significant increase in frontal plane net center of pressure displacement in the eyes-closed condition. Net center of pressure displacement and frequency were significantly correlated to the Bath Ankylosing Spondylitis Functional Index, and individual components of the Bath Ankylosing Spondylitis Metrology Index.

Interpretation

Quiet standing postural control was altered particularly so in the frontal plane in patients with ankylosing spondylitis, which may be associated with increased fall risk. Posturographic measures of postural control may serve as valuable clinical tools for the monitoring of disease progression and disease status in ankylosing spondylitis.